[jira] [Created] (ARROW-12655) [C++] Enhance arrow::internal::call_traits to support function pointers (and maybe ...?)

["Weston Pace (Jira)" <ji...@apache.org>]

Weston Pace created ARROW-12655:
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             Summary: [C++] Enhance arrow::internal::call_traits to support function pointers (and maybe ...?)
                 Key: ARROW-12655
                 URL: https://issues.apache.org/jira/browse/ARROW-12655
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Weston Pace


We are relying on call_traits in Future::Then to help type check the callables passed in.  Adding support for function pointers would allow us to simplify code from
{code:java}
fut.Then([](const T& val) { return SomeCbFun(val); });{code}
to...
{code:java}
fut.Then(SomeCbFun);
{code}



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